Silicon-carbon anode slurry and its preparation method, and preparation method of battery electrode sheets for UAVs.

Abstract

This application provides a silicon-carbon anode slurry, its preparation method, and a method for preparing battery electrodes for unmanned aerial vehicles (UAVs). The preparation method of the silicon-carbon anode slurry for UAV batteries includes the following steps: grinding a mixture of silicon-carbon material and graphite to obtain a silicon-carbon anode material; adding a conductive polymer to the silicon-carbon anode material for mixing to obtain a slurry; and adding a mixed solution of InCl3 and SnCl4 to the slurry for bonding treatment to obtain a silicon-carbon anode slurry for UAV batteries with a three-dimensional network conductive structure. The preparation method of the silicon-carbon anode slurry for UAV batteries described above can improve the initial capacity and cycle performance of the battery.

Description

Technical Field

[0001] This invention relates to the field of silicon-carbon anode technology for unmanned aerial vehicle (UAV) batteries, and in particular to a silicon-carbon anode slurry, its preparation method, and a method for preparing UAV battery electrodes. Background Technology

[0002] Lithium-ion batteries can stably store energy and efficiently convert electrical and chemical energy. They offer advantages such as environmental friendliness, high energy storage capacity, long cycle life, and good continuity, making them widely used in small electronic devices like mobile phones, watches, and computers. However, with the development and increasing demand for large-scale equipment such as electric vehicles and electric aircraft, the performance requirements for lithium-ion batteries are correspondingly increasing. Currently, commercially available lithium-ion batteries generally use graphite as the negative electrode material. Graphite has low cost, stable structure, and good cycle performance, but its theoretical capacity is low, and its high-rate discharge performance is poor. As the battery industry rapidly advances, graphite is gradually failing to meet the requirements for a negative electrode in high-energy-density lithium-ion batteries.

[0003] The theoretical capacity of silicon (Si) can reach 4200 mAh·g. -1 Silicon (Si) has a capacity 10 times that of graphite, providing a higher energy density. The delithiation potential of Si is 0.4V, which minimizes lithium dendrite formation and contributes to improved battery system safety. Si boasts high capacity and abundant resources, making it a significant advantage as a negative electrode material in lithium-ion batteries. However, the volume of Si undergoes substantial changes during lithium insertion and extraction, with an expansion rate reaching up to 300%. This large volume change damages the internal structure of the electrode, impairing the contact between the active material and the current collector, and disrupting the internal conductive network. It also causes continuous rupture and recombination of the SEI film, severely consuming electrolyte and recyclable lithium, leading to a rapid decrease in electrode capacity and significantly impairing battery cycle life. Therefore, finding suitable bonding methods to mitigate the performance degradation of active materials caused by volume expansion is crucial for improving the lifespan and stability of silicon-based lithium-ion batteries. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a silicon-carbon anode slurry and its preparation method that can improve the initial capacity and cycle performance of batteries, as well as a method for preparing battery electrodes for drones.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for preparing a silicon-carbon anode slurry for unmanned aerial vehicle (UAV) batteries includes the following steps:

[0007] A silicon-carbon anode material is obtained by grinding a mixture of silicon-carbon material and graphite.

[0008] The conductive polymer is added to the silicon-carbon anode material and mixed to obtain a slurry;

[0009] A mixed solution of InCl3 and SnCl4 was added to the slurry for bonding treatment to obtain a silicon-carbon anode slurry for UAV batteries with a three-dimensional network conductive structure.

[0010] In one embodiment, the mass ratio of the silicon-carbon material to the graphite is 7:3.

[0011] In one embodiment, the conductive polymer is poly(3,4-ethylenedioxythiophene) and / or polystyrene sulfonate.

[0012] In one embodiment, the bonding process takes 0.5 h to 2 h.

[0013] In one embodiment, the silicon-carbon material comprises silicon and carbon, wherein the mass ratio of silicon to the conductive polymer is 3 to 5.

[0014] In one embodiment, the InCl3 and SnCl4 mixed solution contains In 3+ With Sn 4+ The molar ratio is 1 to 2.5.

[0015] In one embodiment, the sum of the concentrations of InCl3 and SnCl4 is 0.03 mol / L to 0.09 mol / L.

[0016] A silicon-carbon anode slurry for drone batteries, obtained by the preparation method of silicon-carbon anode slurry for drone batteries described in any of the above embodiments.

[0017] A method for preparing battery electrodes for unmanned aerial vehicles (UAVs) involves processing the silicon-carbon negative electrode slurry for UAVs described in the above embodiments using the following steps:

[0018] Deionized water was added to the silicon-carbon anode slurry for the UAV battery and mixed and stirred to obtain the electrode slurry.

[0019] The electrode paste is coated onto a copper foil;

[0020] The copper foil coated with the electrode paste is placed in an oven for vacuum drying.

[0021] The copper foil, after vacuum drying, is then stamped to obtain battery electrodes for drones.

[0022] In one embodiment, the step of coating the electrode paste onto the copper foil specifically involves using a scraper or a coating machine to coat the electrode paste onto the copper foil.

[0023] In one embodiment, the step of stamping the vacuum-dried copper foil to obtain a battery electrode for a drone specifically involves: using a stamping machine to stamp the vacuum-dried copper foil to obtain a battery electrode for a drone.

[0024] In one embodiment, the vacuum drying process is carried out at 80°C.

[0025] In one embodiment, the vacuum drying process takes 12 hours. Compared with the prior art, the present invention has at least the following advantages:

[0026] 1) The conductive polymer and silicon-carbon anode material have poor compatibility and are easily separated even after mixing and stirring. To improve the bonding between the conductive polymer and the silicon-carbon anode material, the preparation method of the silicon-carbon anode slurry for UAV batteries of this invention adds InCl3 and SnCl4. 3+ and Sn 4+ It undergoes a cross-linking reaction with conductive polymers, that is, it causes the chain-like conductive polymer to pass through In... 3+ and Sn 4+ A cross-linked network structure is formed, which makes it easier for the conductive polymer to adhere to the silicon-carbon anode material, and In 3+ and Sn 4+ Both undergo coordination reactions with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Both form coordination bonds with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Adsorbed onto the surface of the silicon-carbon anode material, the conductive polymer in the cross-linked network structure also more easily approaches the silicon-carbon anode material, further facilitating the adhesion of the conductive polymer to the silicon-carbon anode material. This is achieved through a dual-ion induced cross-linking method, allowing the conductive polymer and In... 3+ Sn 4+ A three-dimensional conductive network structure is formed on the silicon-carbon anode material, i.e., a three-dimensional conductive network structure is formed in situ on the silicon-carbon anode material, resulting in a silicon-carbon anode slurry for drone batteries with a three-dimensional conductive network structure. This slurry is then processed to prepare the electrode material for the drone battery electrode sheet. The three-dimensional conductive network structure improves the strength of the electrode material on the drone battery electrode sheet, thus ensuring the structural stability of the silicon-carbon anode for drone batteries. Furthermore, the conductive polymer and In... 3+ Sn 4+ And silicon-carbon anode materials form a three-dimensional network conductive structure, enabling conductive polymers and In 3+ Sn 4+Furthermore, silicon-carbon anode materials exhibit high consistency in volume changes, meaning that the internal changes within the three-dimensional network conductive structure are highly consistent during silicon lithium insertion and extraction. This results in fewer cracks in the three-dimensional network conductive structure, mitigating the problem of poor internal consistency and crack formation caused by the non-three-dimensional nature of traditional binders and silicon-carbon anode materials. In other words, the three-dimensional network conductive structure possesses self-healing properties. 3+ and Sn 4+ The coordination with the silicon-carbon anode material further ensures the self-healing property of the three-dimensional network conductive structure, thereby further improving the structural stability of the silicon-carbon anode for drone batteries, reducing the phenomenon of deformation or even collapse of the internal structure of the electrode, and making the silicon-carbon anode material less prone to powder shedding, thus ensuring the cycle performance of the silicon-carbon anode for drone batteries. It also reduces the phenomenon of SEI film rupture and recombination, thereby reducing the consumption of electrolyte and recyclable lithium, further ensuring the cycle performance of the silicon-carbon anode for drone batteries. In addition, the conductive polymer in the three-dimensional network conductive structure is bonded to the surface of the silicon-carbon anode material. The polymer chains of the conductive polymer are flexible, providing expansion space for silicon lithium intercalation, allowing silicon to expand to easily accommodate lithium, thus ensuring the effect of silicon lithium intercalation, and thus ensuring the rate performance of the silicon-carbon anode for drone batteries.

[0027] 2) The bonding method of the silicon-carbon anode for UAV batteries of the present invention uses graphite and conductive polymer, both of which are conductive. The bimetallic ions in the cross-linked network structure are connected to the conductive polymer, silicon and graphite respectively, so that graphite and conductive polymer are electrically connected to silicon, thus ensuring the conductivity of the three-dimensional network conductive structure. Moreover, the cross-linked network structure has good continuity, which in turn ensures the continuity of the three-dimensional network conductive structure, further ensuring the conductivity of the three-dimensional network conductive structure, thereby increasing the proportion of non-conductive silicon material in the electrode, thereby increasing the capacity of the silicon-carbon anode for lithium in UAV batteries, and thus ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0028] 3) The bonding method of silicon-carbon negative electrode for drone battery of the present invention can improve the initial discharge capacity of drone battery by adding tin ions, but the cycle performance of tin ions is poor; while indium ions can improve the cycle performance. Therefore, the addition of tin ions and indium ions makes the battery performance complementary, effectively improving the initial discharge capacity of drone battery and reducing the capacity decay rate of drone battery in long-term cycle, that is, further improving the cycle performance and rate performance of drone battery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of a method for preparing silicon-carbon anode slurry for unmanned aerial vehicle (UAV) batteries according to an embodiment of the present invention.

[0031] Figure 2 This is a scanning electron microscope image of a battery electrode for a drone according to another embodiment of the present invention after 100 cycles.

[0032] Figure 3 This is a charge-discharge curve of the battery electrode for a drone in the early stage of cycling, according to another embodiment of the present invention.

[0033] Figure 4 Charge-discharge curves for the initial cycling stage of a traditional binder-alginate negative electrode;

[0034] Figure 5 The cycle performance diagram of a battery electrode for a drone according to another embodiment of the present invention is shown.

[0035] Figure 6 The cycling performance diagram is for a traditional binder-alginate negative electrode.

[0036] Figure 7 This is a flowchart illustrating a method for preparing battery electrodes for unmanned aerial vehicles according to another embodiment of the present invention.

[0037] Figure 8 Cycle rate diagram of battery electrode for drones according to another embodiment of the present invention;

[0038] Figure 9 This is an electron microscope image of a traditional silicon-carbon anode during the initial stage of cycling.

[0039] Figure 10 This is an electron microscope image of the electrode sheet of a drone battery in the early stage of cycling, according to another embodiment of the present invention. Detailed Implementation

[0040] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] This application provides a method for preparing a silicon-carbon anode slurry for drone batteries. The method includes the following steps: grinding a mixture of silicon-carbon material and graphite to obtain a silicon-carbon anode material; adding a conductive polymer to the silicon-carbon anode material for mixing to obtain a slurry; and adding a mixed solution of InCl3 and SnCl4 to the slurry for bonding treatment to obtain a silicon-carbon anode slurry for drone batteries with a three-dimensional network conductive structure.

[0044] The conductive polymer and silicon-carbon anode material have poor compatibility and are easily separated even after mixing. To improve the bonding between the conductive polymer and the silicon-carbon anode material, the above-mentioned method for preparing silicon-carbon anode slurry for UAV batteries incorporates InCl3 and SnCl4. 3+ and Sn 4+ It undergoes a cross-linking reaction with conductive polymers, that is, it causes the chain-like conductive polymer to pass through In... 3+ and Sn 4+ A cross-linked network structure is formed, which makes it easier for the conductive polymer to adhere to the silicon-carbon anode material, and In 3 + and Sn 4+ Both undergo coordination reactions with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Both form coordination bonds with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Adsorbed onto the surface of the silicon-carbon anode material, the conductive polymer in the cross-linked network structure also more easily approaches the silicon-carbon anode material, further facilitating the adhesion of the conductive polymer to the silicon-carbon anode material. This is achieved through a dual-ion induced cross-linking method, allowing the conductive polymer and In... 3+ Sn 4+A three-dimensional conductive network structure is formed on the silicon-carbon anode material, i.e., a three-dimensional conductive network structure is formed in situ on the silicon-carbon anode material, resulting in a silicon-carbon anode slurry for drone batteries with a three-dimensional conductive network structure. This slurry is then processed to prepare the electrode material for the drone battery electrode sheet. The three-dimensional conductive network structure improves the strength of the electrode material on the drone battery electrode sheet, thus ensuring the structural stability of the silicon-carbon anode for drone batteries. Furthermore, the conductive polymer and In... 3+ Sn 4+ And silicon-carbon anode materials form a three-dimensional network conductive structure, enabling conductive polymers and In 3+ Sn 4+ Furthermore, silicon-carbon anode materials exhibit high consistency in volume changes, meaning that the internal changes within the three-dimensional network conductive structure are highly consistent during silicon lithium insertion and extraction. This results in fewer cracks in the three-dimensional network conductive structure, mitigating the problem of poor internal consistency and crack formation caused by the non-three-dimensional nature of traditional binders and silicon-carbon anode materials. In other words, the three-dimensional network conductive structure possesses self-healing properties. 3+ and Sn 4+ The coordination with the silicon-carbon anode material further ensures the self-healing property of the three-dimensional network conductive structure, thereby further improving the structural stability of the silicon-carbon anode for drone batteries, reducing the phenomenon of deformation or even collapse of the internal structure of the electrode, and making the silicon-carbon anode material less prone to powder shedding, thus ensuring the cycle performance of the silicon-carbon anode for drone batteries. It also reduces the phenomenon of SEI film rupture and recombination, thereby reducing the consumption of electrolyte and recyclable lithium, further ensuring the cycle performance of the silicon-carbon anode for drone batteries. In addition, the conductive polymer in the three-dimensional network conductive structure is bonded to the surface of the silicon-carbon anode material. The polymer chains of the conductive polymer are flexible, providing expansion space for silicon lithium intercalation, allowing silicon to expand to easily accommodate lithium, thus ensuring the effect of silicon lithium intercalation, and thus ensuring the rate performance of the silicon-carbon anode for drone batteries.

[0045] Furthermore, both graphite and conductive polymers are conductive. The bimetallic ions in the cross-linked network structure are connected to the conductive polymer, silicon, and graphite respectively, so that both graphite and conductive polymers are electrically connected to silicon, thus ensuring the conductivity of the three-dimensional network conductive structure. Moreover, the cross-linked network structure has good continuity, which in turn ensures the continuity of the three-dimensional network conductive structure, further ensuring the conductivity of the three-dimensional network conductive structure. This increases the proportion of non-conductive silicon material in the electrode, thereby increasing the lithium capacity of the silicon-carbon anode for UAV batteries, and thus ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0046] Furthermore, the addition of tin ions can increase the initial discharge capacity of drone batteries, but tin ions have poor cycle performance; while indium ions can improve cycle performance. Therefore, the addition of tin ions and indium ions makes the battery performance complementary, effectively improving the initial discharge capacity of drone batteries and reducing the capacity decay rate of drone batteries during long-term cycling, that is, further improving the cycle performance and rate performance of drone batteries.

[0047] Furthermore, the process is relatively simple, the reaction conditions are relatively mild, and it is easy to industrialize.

[0048] To better understand the bonding method of the silicon-carbon anode for drone batteries of this application, the following further explanation is provided:

[0049] Please see Figure 1 One embodiment of the method for preparing silicon-carbon anode slurry for drone batteries includes the following steps:

[0050] S101. A mixture of silicon-carbon material and graphite is ground to obtain a silicon-carbon anode material. It can be understood that the grinding process ensures uniform mixing of the silicon-carbon material and graphite, allowing graphite, as a conductive material on the electrode, to be more evenly distributed, thus reducing internal variations within the electrode.

[0051] S102. The conductive polymer is added to the silicon-carbon anode material and mixed to obtain a slurry. It can be understood that the conductive polymer has adhesive properties; adding the conductive polymer to the silicon-carbon anode material and mixing it can initially obtain a silicon-carbon anode material mixed with a binder.

[0052] S103. A mixed solution of InCl3 and SnCl4 is added to the slurry for bonding treatment, resulting in a silicon-carbon anode slurry for UAV batteries with a three-dimensional network conductive structure. It can be understood that adding the mixed solution of InCl3 and SnCl4 to the slurry for bonding treatment significantly improves the adhesion of the silicon-carbon anode material, thereby enhancing the electrochemical stability and cycle performance of the silicon-carbon anode for UAV batteries.

[0053] The conductive polymer and silicon-carbon anode material have poor compatibility and are easily separated even after mixing. To improve the bonding between the conductive polymer and the silicon-carbon anode material, the above-mentioned method for preparing silicon-carbon anode slurry for UAV batteries incorporates InCl3 and SnCl4. 3+ and Sn 4+ It undergoes a cross-linking reaction with conductive polymers, that is, it causes the chain-like conductive polymer to pass through In... 3+ and Sn 4+A cross-linked network structure is formed, which makes it easier for the conductive polymer to adhere to the silicon-carbon anode material, and In 3 + and Sn 4+ Both undergo coordination reactions with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Both form coordination bonds with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Adsorbed onto the surface of the silicon-carbon anode material, the conductive polymer in the cross-linked network structure also more easily approaches the silicon-carbon anode material, further facilitating the adhesion of the conductive polymer to the silicon-carbon anode material. This is achieved through a dual-ion induced cross-linking method, allowing the conductive polymer and In... 3+ Sn 4+ A three-dimensional conductive network structure is formed on the silicon-carbon anode material, i.e., a three-dimensional conductive network structure is formed in situ on the silicon-carbon anode material, resulting in a silicon-carbon anode slurry for drone batteries with a three-dimensional conductive network structure. This slurry is then processed to prepare the electrode material for the drone battery electrode sheet. The three-dimensional conductive network structure improves the strength of the electrode material on the drone battery electrode sheet, thus ensuring the structural stability of the silicon-carbon anode for drone batteries. Furthermore, the conductive polymer and In... 3+ Sn 4+ And silicon-carbon anode materials form a three-dimensional network conductive structure, enabling conductive polymers and In 3+ Sn 4+ Furthermore, silicon-carbon anode materials exhibit high consistency in volume changes, meaning that the internal changes within the three-dimensional network conductive structure are highly consistent during silicon lithium insertion and extraction. This results in fewer cracks in the three-dimensional network conductive structure, mitigating the problem of poor internal consistency and crack formation caused by the non-three-dimensional nature of traditional binders and silicon-carbon anode materials. In other words, the three-dimensional network conductive structure possesses self-healing properties. 3+ and Sn 4+ The coordination with the silicon-carbon anode material further ensures the self-healing property of the three-dimensional network conductive structure, thereby further improving the structural stability of the silicon-carbon anode for drone batteries, reducing the phenomenon of deformation or even collapse of the internal structure of the electrode, and making the silicon-carbon anode material less prone to powder shedding, thus ensuring the cycle performance of the silicon-carbon anode for drone batteries. It also reduces the phenomenon of SEI film rupture and recombination, thereby reducing the consumption of electrolyte and recyclable lithium, further ensuring the cycle performance of the silicon-carbon anode for drone batteries. In addition, the conductive polymer in the three-dimensional network conductive structure is bonded to the surface of the silicon-carbon anode material. The polymer chains of the conductive polymer are flexible, providing expansion space for silicon lithium intercalation, allowing silicon to expand to easily accommodate lithium, thus ensuring the effect of silicon lithium intercalation, and thus ensuring the rate performance of the silicon-carbon anode for drone batteries.

[0054] Furthermore, both graphite and conductive polymers are conductive. The bimetallic ions in the cross-linked network structure are connected to the conductive polymer, silicon, and graphite respectively, so that both graphite and conductive polymers are electrically connected to silicon, thus ensuring the conductivity of the three-dimensional network conductive structure. Moreover, the cross-linked network structure has good continuity, which in turn ensures the continuity of the three-dimensional network conductive structure, further ensuring the conductivity of the three-dimensional network conductive structure. This increases the proportion of non-conductive silicon material in the electrode, thereby increasing the lithium capacity of the silicon-carbon anode for UAV batteries, and thus ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0055] Furthermore, the addition of tin ions can increase the initial discharge capacity of drone batteries, but tin ions have poor cycle performance; while indium ions can improve cycle performance. Therefore, the addition of tin ions and indium ions makes the battery performance complementary, effectively improving the initial discharge capacity of drone batteries and reducing the capacity decay rate of drone batteries during long-term cycling, that is, further improving the cycle performance and rate performance of drone batteries.

[0056] Furthermore, the process is relatively simple, the reaction conditions are relatively mild, and it is easy to industrialize.

[0057] In one embodiment, indium and tin ions are crosslinking agents that improve the lithium ion intercalation / deintercalation capability.

[0058] In one embodiment, the mass ratio of silicon-carbon material to graphite is 7:3. It is understood that both graphite and the conductive polymer are conductive. The bimetallic ions in the cross-linked network structure are connected to the conductive polymer, silicon, and graphite respectively, ensuring that both graphite and the conductive polymer are electrically connected to silicon. This ensures the conductivity of the three-dimensional network conductive structure. Furthermore, the cross-linked network structure has good continuity, further ensuring the continuity of the three-dimensional network conductive structure and thus further ensuring its conductivity. This increases the proportion of non-conductive silicon material in the electrode, raising the proportion of silicon-carbon material in the silicon-carbon anode material to 70%. This significantly improves the lithium capacity of the silicon-carbon anode for UAV batteries, thereby ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0059] In one embodiment, the step of adding a mixed solution of InCl3 and SnCl4 to a slurry for bonding treatment to obtain a silicon-carbon anode slurry for drone batteries with a three-dimensional network conductive structure specifically involves: adding a mixed solution of InCl3 and SnCl4 to the slurry for mixing and stirring to obtain a silicon-carbon anode slurry for drone batteries with a three-dimensional network conductive structure. It can be understood that the mixture of silicon-carbon material and graphite is uniformly mixed during the grinding operation, allowing graphite, as a conductive material on the electrode, to be more uniformly distributed on the electrode, reducing internal electrode variables. Simultaneously, the mixing and stirring operation ensures that the InCl3-SnCl4 mixture has a three-dimensional network conductive structure.3+ Sn 4+ The cross-linking reaction with the conductive polymer is more thorough, thereby improving the continuity of the three-dimensional network conductive structure. The mixing and stirring operation also makes the products of the cross-linking reaction more uniformly bonded to the surface of the silicon-carbon anode material. That is, the conductive polymer, as the conductive material on the electrode, is also more uniformly distributed on the electrode, further reducing the internal variables of the electrode, improving the electrochemical stability of the silicon-carbon anode for UAV batteries, and improving the structural stability of the silicon-carbon anode for UAV batteries, further ensuring the cycle performance of the silicon-carbon anode for UAV batteries.

[0060] It is understandable that the rapid addition of a mixed solution of InCl3 and SnCl4 to the slurry for bonding treatment would cause InCl3 to... 3+ and Sn 4+ The uneven distribution of In on the electrode surface reduces the continuity of the three-dimensional network conductive structure. To make In... 3+ and Sn 4+ The solution is evenly distributed on the electrode surface. During the first third of the liquid addition operation time, the mixed solution of InCl3 and SnCl4 is added to the slurry at a rate of 0.1 mL / s. During the middle third of the liquid addition operation time, the mixed solution of InCl3 and SnCl4 is added to the slurry at a rate of 0.2 mL / s. During the last third of the liquid addition operation time, the mixed solution of InCl3 and SnCl4 is added to the slurry at a rate of 0.5 mL / s.

[0061] In order to further enable In 3+ and Sn 4+ After the electrode surface is relatively uniformly distributed, and a mixed solution of InCl3 and SnCl4 is added to the slurry for bonding treatment to obtain a silicon-carbon anode slurry for UAV batteries with a three-dimensional network conductive structure, the silicon-carbon anode slurry for UAV batteries is subjected to a static treatment. In one embodiment, the conductive polymer is poly(3,4-ethylenedioxythiophene) and / or polystyrene sulfonate. It can be understood that poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate are both high molecular weight polymers. The cross-linked network structure produced by the cross-linking reaction with chloride has good continuity, thereby ensuring the continuity of the three-dimensional network conductive structure. Moreover, poly(3,4-ethylenedioxythiophene) has good conductivity, which ensures the charge transport effect of the three-dimensional network conductive structure, thereby increasing the proportion of non-conductive silicon material in the electrode, thereby increasing the lithium capacity of the silicon-carbon anode for UAV batteries, and thus ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0062] In one embodiment, the bonding treatment time is 0.5h to 2h. It can be understood that when the bonding treatment time is 0.5h to 2h, tin ions, indium ions, and the conductive polymer undergo a more complete cross-linking reaction, resulting in a cross-linked network structure with better continuity. This ensures the continuity of the three-dimensional network conductive structure, thus ensuring the charge transport effect of the three-dimensional network conductive structure. This, in turn, increases the proportion of non-conductive silicon material in the electrode, thereby increasing the lithium capacity of the silicon-carbon anode in the UAV battery, and ultimately ensuring the initial capacity and rate performance of the silicon-carbon anode in the UAV battery.

[0063] In one embodiment, the silicon-carbon material comprises silicon and carbon, with a silicon-to-conductive polymer mass ratio of 3 to 5. It is understood that when the silicon-to-conductive polymer mass ratio is 3 to 5, the silicon-carbon anode for drone batteries exhibits good conductivity while simultaneously increasing the silicon content, thereby providing more vacancy sites for lithium intercalation and ultimately improving the initial capacity and rate performance of the silicon-carbon anode for drone batteries.

[0064] In one embodiment, the InCl3 and SnCl4 mixed solution contains In 3+ With Sn 4+ The molar ratio is 1–2.5. This is understandable. 3+ It has good cycle performance, which makes up for the shortcomings of Sn. 4+ The shortcomings in cyclic performance, while Sn 4+ The addition of [something] can increase the initial discharge capacity of drone batteries, when In 3+ With Sn 4+ When the molar ratio is 1 to 2.5, InCl3 and SnCl4 can undergo a more complete cross-linking reaction with the conductive polymer, while ensuring the initial discharge capacity of the UAV battery and reducing the capacity decay rate of the UAV battery during long-term cycling, thus improving the cycle performance and rate performance of the UAV battery.

[0065] In one embodiment, the sum of the concentrations of InCl3 and SnCl4 is 0.03 mol / L to 0.09 mol / L. It can be understood that when the sum of the concentrations of InCl3 and SnCl4 is 0.03 mol / L to 0.09 mol / L, the mixture of silicon-carbon anode material, conductive polymer, and chloride is in a state of good fluidity, making it easy to stir evenly and allowing the conductive polymer and InCl4 to mix. 3+ and Sn 4+The cross-linking reaction proceeds more fully, and the products of the cross-linking reaction adhere more uniformly to the surface of the silicon-carbon anode material. This means that the conductive material is more uniformly distributed on the electrode, reducing internal variables of the electrode and improving the electrochemical stability of the silicon-carbon anode for UAV batteries. It also improves the adhesion stability of the conductive polymer to the silicon-carbon anode material, thereby improving the structural stability of the silicon-carbon anode for UAV batteries and further enhancing its electrochemical stability. At the same time, the relatively high concentration of 0.03 mol / L to 0.09 mol / L allows the chloride to induce the conductive polymer more fully, further ensuring that the cross-linked material is more uniformly distributed on the electrode, and further improving the electrochemical stability of the silicon-carbon anode for UAV batteries.

[0066] This application also provides a silicon-carbon anode slurry for drone batteries, which is obtained by the preparation method of silicon-carbon anode slurry for drone batteries described in any of the above embodiments.

[0067] This application also provides a method for preparing battery electrodes for unmanned aerial vehicles (UAVs), which involves processing the silicon-carbon negative electrode slurry for UAVs described in the above embodiments using the following steps:

[0068] S201. Add deionized water to the silicon-carbon negative electrode slurry for UAV batteries and mix and stir to obtain electrode slurry.

[0069] In this embodiment, deionized water is used to dilute the silicon-carbon anode slurry for drone batteries to obtain an electrode slurry. This improves the fluidity of the electrode slurry, facilitating its coating onto copper foil in the subsequent step S203. Adding deionized water to the silicon-carbon anode slurry for mixing and stirring improves its uniformity, which in turn enhances the uniformity of the electrode slurry coated onto the copper foil surface in step S203. This, in turn, improves the electrochemical stability of the silicon-carbon anode for drone batteries, as well as the adhesion stability between the electrode slurry and the copper foil, thereby improving the structural stability of the silicon-carbon anode for drone batteries and ultimately enhancing its electrochemical stability.

[0070] S203. Coat the electrode paste onto the copper foil.

[0071] In this embodiment, the copper foil serves as the current collector, and the conductive polymer has adhesive properties, which improves the adhesion stability between the electrode slurry and the copper foil, thereby improving the structural stability of the silicon-carbon anode for UAV batteries and, consequently, the electrochemical stability of the silicon-carbon anode for UAV batteries.

[0072] S205. Place the copper foil coated with electrode paste into an oven and perform vacuum drying.

[0073] In this embodiment, the electrode paste coated on the copper foil after step S203 has a lot of moisture. Moisture will have a significant impact on the performance of the UAV battery. Therefore, vacuum drying is required to remove the moisture from the electrode paste.

[0074] S207. The copper foil after vacuum drying is stamped to obtain battery electrodes for drones.

[0075] In this embodiment, the copper foil processed in step S205 still has many burrs, which need to be removed by stamping to avoid adverse effects caused by the burrs.

[0076] In one embodiment, the step of coating the electrode paste onto the copper foil specifically involves using a scraper or coating machine to coat the electrode paste onto the copper foil. It is understood that using a scraper or coating machine to coat the electrode paste results in a more uniform coating, improving the electrochemical stability of the silicon-carbon anode in UAV batteries.

[0077] In one embodiment, the step of stamping the vacuum-dried copper foil to obtain battery electrodes for drones specifically involves: using a stamping machine to stamp the vacuum-dried copper foil to obtain battery electrodes for drones. It is understood that using a stamping machine to stamp the vacuum-dried copper foil yields better stamping results.

[0078] In one embodiment, the vacuum drying process is carried out at 80°C. It is understood that vacuum drying at 80°C results in better moisture removal.

[0079] In one embodiment, the vacuum drying process takes 12 hours. It is understood that when the vacuum drying process takes 12 hours, the moisture removal is more complete.

[0080] Example 1

[0081] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 3:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ The concentration was 0.06 mol / L and Sn 4+A mixed solution of InCl3 and SnCl4 with a concentration of 0.03 mol / L was added to the slurry and stirred for 2 hours to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper or coating machine. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0082] Example 2

[0083] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 4:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 1:1 and In 3+ With Sn 4+ A mixed solution of InCl3 and SnCl4 with a combined concentration of 0.09 mol / L was added to the slurry and stirred for 2 hours to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0084] Example 3

[0085] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 4:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 5:2 and In 3+ With Sn 4+A mixed solution of InCl3 and SnCl4 with a combined concentration of 0.09 mol / L was added to the slurry and stirred for 2 hours to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0086] Example 4

[0087] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 3:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 5:2 and In 3+ With Sn 4+ A mixed solution of InCl3 and SnCl4 with a total concentration of 0.05 mol / L was added to the slurry and stirred for 1 hour to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0088] Example 5

[0089] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 5:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 1:1 and In 3+ With Sn 4+A mixed solution of InCl3 and SnCl4 with a combined concentration of 0.09 mol / L was added to the slurry and stirred for 2 hours to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0090] Example 6

[0091] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 4:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 2:1 and In 3+ With Sn 4+ A mixed solution of InCl3 and SnCl4 with a total concentration of 0.05 mol / L was added to the slurry and stirred for 1 hour to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0092] Example 7

[0093] Silicon-carbon material and graphite were weighed at a mass ratio of 7:3 and mixed. The mixture was then ground for 0.5 hours to obtain a silicon-carbon anode material. Next, a conductive polymer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate was weighed at a mass ratio of 4:1 (silicon to conductive polymer in the silicon-carbon anode material). This conductive polymer was added to the silicon-carbon anode material at room temperature and stirred for 1 hour to obtain a slurry. Then, In... 3+ With Sn 4+ The molar ratio is 1:1 and In 3+ With Sn 4+A mixed solution of InCl3 and SnCl4 with a total concentration of 0.03 mol / L was added to the slurry and stirred for 0.5 hours to obtain a silicon-carbon anode slurry for UAV batteries. Then, deionized water was added to the silicon-carbon anode slurry for UAV batteries and mixed and stirred to obtain an electrode slurry. Next, the electrode slurry was coated onto copper foil using a scraper. Then, the copper foil coated with electrode slurry was placed in an oven for vacuum drying at 80°C for 12 hours. Finally, the vacuum-dried copper foil was punched into circular electrode sheets with a diameter of 12 mm using a punching machine.

[0094] Comparative Example 1

[0095] Weigh silicon-carbon material and graphite at a mass ratio of 7:3, mix them, and then grind them for 0.5 hours to obtain silicon-carbon anode material. Next, weigh alginate at a mass ratio of 4:1 (silicon to alginate in the silicon-carbon anode material), add alginate to the silicon-carbon anode material at room temperature, and stir for 1 hour to obtain silicon-carbon anode slurry. Then, add deionized water to the silicon-carbon anode slurry and mix and stir to obtain electrode slurry. Next, use a coating tool to coat the electrode slurry onto copper foil. Then, place the copper foil coated with electrode slurry into an oven for vacuum drying at 80°C for 12 hours. Finally, use a punching machine to punch the vacuum-dried copper foil into circular electrode sheets with a diameter of 12 mm.

[0096] The cycle performance and specific capacity of the coin cells prepared using the electrodes of Examples 1-7 and Comparative Example 1 were tested below:

[0097] Nine CR2032 coin cells were prepared using the electrodes from Examples 1-7 and Comparative Example 1 as working electrodes. Each coin cell had a diameter of 20 mm and a height of 3 mm. The separator was Celgard 2320, a 16 mm diameter disc. All electrodes were 12 mm diameter discs. The electrolyte consisted of lithium hexafluorophosphate, ethylene carbonate, diethyl carbonate, and fluoroethylene carbonate, with a volume ratio of ethylene carbonate to diethyl carbonate of 1:1. The concentration of lithium hexafluorophosphate was 1 mol / L, and fluoroethylene carbonate comprised 10% of the electrolyte volume. The lithium electrode served as both the counter and reference electrode. The assembly of these batteries was carried out in a glove box under argon atmosphere, following the sequence of negative electrode shell, spring, gasket, lithium electrode, separator, silicon electrode, and positive electrode shell. The batteries were then sealed using a sealing machine and allowed to stand for 12-24 hours. The coin cells prepared with the electrodes of Examples 1-7 were subjected to electrochemical performance tests at a discharge current density of 240 mA / g, and the coin cells prepared with the electrode of Comparative Example 1 were subjected to electrochemical performance tests at a discharge current density of 50 mA / g. The masses of the electrodes of Examples 1-7 and Comparative Example 1 were weighed sequentially, and the masses of the corresponding copper foils were subtracted from the electrode masses to obtain the masses of the corresponding copper foil coating materials.

[0098] 1. The surface morphology of the electrode sheet of Example 1 after 100 cycles of testing is as follows: Figure 2 As shown, several microcracks appeared on the surface of the electrode, but it remained in a blocky state without pulverization. This indicates that the binder formed by the dual-ion-induced cross-linked conductive polymer improved the adhesion and structural stability of the material. In other words, the preparation method of the silicon-carbon anode slurry for UAV batteries improved the adhesion and structural stability of the material, thereby improving the cycle performance and electrochemical stability of the silicon-carbon anode for UAV batteries.

[0099] 2. For example Figure 3 As shown, in the initial cycle stage of the coin cell prepared by the electrode in Example 2, the coin cell prepared by the electrode in Example 2 was first charged to a voltage of 1.2V, and then discharged with a discharge current density of 240mA / g, resulting in an initial discharge capacity of 2083mAh / g for the coin cell prepared by the electrode in Example 2.

[0100] like Figure 4 As shown, in the initial cycling stage of the coin cell prepared by the electrode of Comparative Example 1, the coin cell prepared by the electrode of Comparative Example 1 was first charged to a voltage of 1.2V, and then discharged with a discharge current density of 50mA / g, resulting in an initial discharge capacity of 735mAh / g for the coin cell prepared by the electrode of Comparative Example 1.

[0101] When measuring capacitance using the constant current method, an increase in discharge current density results in a smaller measured capacitance. The discharge current density of the coin cell prepared with the electrode of Example 2 (240 mA / g) is greater than that of the coin cell prepared with the electrode of Comparative Example 1 (50 mA / g). This indicates that Example 2 does not have an advantage in the test. Furthermore, under the conditions that both are in the early stage of cycling and are charged to the same voltage, the initial discharge capacity of the coin cell prepared with the electrode of Example 2 (2083 mAh / g) is still significantly higher than that of the coin cell prepared with the electrode of Comparative Example 1 (735 mAh / g). This demonstrates that the battery prepared by the bonding method of silicon-carbon anode for UAV batteries in this application has a higher initial discharge capacity.

[0102] 3. For example Figure 5 As shown, the coin cell prepared by the electrode of Example 3 was subjected to cycle performance testing under the condition of discharge current density of 240mA / g. The discharge specific capacity after 120 cycles was 950mAh / g.

[0103] like Figure 6 As shown, the coin cell prepared from the electrode of Comparative Example 1 was subjected to cycle performance testing under the condition of a discharge current density of 50 mA / g. The discharge specific capacity after 30 cycles was 165 mAh / g.

[0104] The discharge specific capacity of the coin cell prepared by the electrode of Example 3 after a relatively large number of cycles is significantly higher than that of the coin cell prepared by the electrode of Comparative Example 1 after a relatively small number of cycles, indicating that the battery prepared by the bonding method of silicon-carbon anode for UAV batteries of this application has better cycle performance.

[0105] 4. Under the condition of a discharge current density of 240 mA / g, the coin cells prepared by the electrodes of Examples 4 to 7 were subjected to cycle performance tests in sequence. After 120 cycles, the discharge specific capacity was 870 mAh / g, 900 mAh / g, 920 mAh / g and 805 mAh / g, respectively, which were significantly higher than the discharge specific capacity of 165 mAh / g of the coin cell prepared by the electrode of Comparative Example 1 after 30 cycles.

[0106] The discharge specific capacity of the coin cells prepared by the electrodes of Examples 4 to 7 after multiple cycles is significantly higher than that of the coin cells prepared by the electrodes of Comparative Example 1 after fewer cycles, further demonstrating that the battery prepared by the bonding method of silicon-carbon anode for UAV batteries of this application has better cycle performance.

[0107] 5. For example Figure 8 As shown, the initial battery capacity of the coin cells prepared from the electrodes of Examples 5-7 is at least 1100 mAhhg. -1The above results show that the capacity retention rate is as high as 97.8% after 20 cycles, indicating that the electrode prepared by the bonding method of silicon-carbon anode for UAV batteries in this application has good cycle rate performance.

[0108] 6. For example Figure 9 As shown, traditional silicon-carbon anodes, without the use of binders, have relatively dispersed particles and large pores, indicating that traditional silicon-carbon anodes have poor continuity.

[0109] 7. For example Figure 10 As shown, the electrode prepared by the bonding method of the UAV battery silicon-carbon anode of this application has good adhesion and continuity.

[0110] Compared with the prior art, the present invention has at least the following advantages:

[0111] 1) The conductive polymer and silicon-carbon anode material have poor compatibility and are easily separated even after mixing and stirring. To improve the bonding between the conductive polymer and the silicon-carbon anode material, the preparation method of the silicon-carbon anode slurry for UAV batteries of this invention adds InCl3 and SnCl4. 3+ and Sn 4+ It undergoes a cross-linking reaction with conductive polymers, that is, it causes the chain-like conductive polymer to pass through In... 3+ and Sn 4+ A cross-linked network structure is formed, which makes it easier for the conductive polymer to adhere to the silicon-carbon anode material, and In 3+ and Sn 4+ Both undergo coordination reactions with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Both form coordination bonds with silicon-carbon anode materials, i.e., In 3+ and Sn 4+ Adsorbed onto the surface of the silicon-carbon anode material, the conductive polymer in the cross-linked network structure also more easily approaches the silicon-carbon anode material, further facilitating the adhesion of the conductive polymer to the silicon-carbon anode material. This is achieved through a dual-ion induced cross-linking method, allowing the conductive polymer and In... 3+ Sn 4+ A three-dimensional conductive network structure is formed on the silicon-carbon anode material, i.e., a three-dimensional conductive network structure is formed in situ on the silicon-carbon anode material, resulting in a silicon-carbon anode slurry for drone batteries with a three-dimensional conductive network structure. This slurry is then processed to prepare the electrode material for the drone battery electrode sheet. The three-dimensional conductive network structure improves the strength of the electrode material on the drone battery electrode sheet, thus ensuring the structural stability of the silicon-carbon anode for drone batteries. Furthermore, the conductive polymer and In... 3+ Sn 4+ And silicon-carbon anode materials form a three-dimensional network conductive structure, enabling conductive polymers and In 3+ Sn4+ Furthermore, silicon-carbon anode materials exhibit high consistency in volume changes, meaning that the internal changes within the three-dimensional network conductive structure are highly consistent during silicon lithium insertion and extraction. This results in fewer cracks in the three-dimensional network conductive structure, mitigating the problem of poor internal consistency and crack formation caused by the non-three-dimensional nature of traditional binders and silicon-carbon anode materials. In other words, the three-dimensional network conductive structure possesses self-healing properties. 3+ and Sn 4+ The coordination with the silicon-carbon anode material further ensures the self-healing property of the three-dimensional network conductive structure, thereby further improving the structural stability of the silicon-carbon anode for drone batteries, reducing the phenomenon of deformation or even collapse of the internal structure of the electrode, and making the silicon-carbon anode material less prone to powder shedding, thus ensuring the cycle performance of the silicon-carbon anode for drone batteries. It also reduces the phenomenon of SEI film rupture and recombination, thereby reducing the consumption of electrolyte and recyclable lithium, further ensuring the cycle performance of the silicon-carbon anode for drone batteries. In addition, the conductive polymer in the three-dimensional network conductive structure is bonded to the surface of the silicon-carbon anode material. The polymer chains of the conductive polymer are flexible, providing expansion space for silicon lithium intercalation, allowing silicon to expand to easily accommodate lithium, thus ensuring the effect of silicon lithium intercalation, and thus ensuring the rate performance of the silicon-carbon anode for drone batteries.

[0112] 2) The bonding method of the silicon-carbon anode for UAV batteries of the present invention uses graphite and conductive polymer, both of which are conductive. The bimetallic ions in the cross-linked network structure are connected to the conductive polymer, silicon and graphite respectively, so that graphite and conductive polymer are electrically connected to silicon, thus ensuring the conductivity of the three-dimensional network conductive structure. Moreover, the cross-linked network structure has good continuity, which in turn ensures the continuity of the three-dimensional network conductive structure, further ensuring the conductivity of the three-dimensional network conductive structure, thereby increasing the proportion of non-conductive silicon material in the electrode, thereby increasing the capacity of the silicon-carbon anode for lithium in UAV batteries, and thus ensuring the initial capacity and rate performance of the silicon-carbon anode for UAV batteries.

[0113] 3) The bonding method of silicon-carbon negative electrode for drone battery of the present invention can improve the initial discharge capacity of drone battery by adding tin ions, but the cycle performance of tin ions is poor; while indium ions can improve the cycle performance. Therefore, the addition of tin ions and indium ions makes the battery performance complementary, effectively improving the initial discharge capacity of drone battery and reducing the capacity decay rate of drone battery in long-term cycle, that is, further improving the cycle performance and rate performance of drone battery.

[0114] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for preparing silicon-carbon anode slurry for unmanned aerial vehicle (UAV) batteries, characterized in that, Includes the following steps: A silicon-carbon anode material is obtained by grinding a mixture of silicon-carbon material and graphite. The conductive polymer is added to the silicon-carbon anode material and mixed to obtain a slurry; A mixed solution of InCl3 and SnCl4 was added to the slurry for bonding treatment to obtain a silicon-carbon anode slurry for UAV batteries with a three-dimensional network conductive structure.

2. The method for preparing silicon-carbon anode slurry for UAV batteries according to claim 1, characterized in that, The mass ratio of the silicon-carbon material to the graphite is 7:3; and / or, The conductive polymer is poly(3,4-ethylenedioxythiophene) and / or polystyrene sulfonate; and / or... The bonding treatment time is 0.5h to 2h.

3. The method for preparing silicon-carbon anode slurry for UAV batteries according to claim 1, characterized in that, The silicon-carbon material comprises silicon and carbon, wherein the mass ratio of silicon to the conductive polymer is 3 to 5.

4. The method for preparing silicon-carbon anode slurry for UAV batteries according to claim 3, characterized in that, The InCl3 and SnCl4 mixed solution contains In 3+ With Sn 4+ The molar ratio is 1 to 2.

5.

5. The method for preparing silicon-carbon anode slurry for UAV batteries according to claim 1, characterized in that, The sum of the concentrations of InCl3 and SnCl4 is 0.03 mol / L to 0.09 mol / L.

6. A silicon-carbon anode slurry for unmanned aerial vehicle (UAV) batteries, characterized in that, The silicon-carbon anode slurry for UAV batteries is obtained by the preparation method of silicon-carbon anode slurry for UAV batteries according to any one of claims 1 to 5.

7. A method for preparing battery electrodes for unmanned aerial vehicles, characterized in that, The silicon-carbon anode slurry for UAV batteries according to claim 6 is processed by the following steps: Deionized water was added to the silicon-carbon anode slurry for the UAV battery and mixed and stirred to obtain the electrode slurry. The electrode paste is coated onto a copper foil; The copper foil coated with the electrode paste is placed in an oven for vacuum drying. The copper foil, after vacuum drying, is then stamped to obtain battery electrodes for drones.

8. The method for preparing battery electrodes for unmanned aerial vehicles according to claim 7, characterized in that, The step of coating the electrode paste onto the copper foil specifically involves using a scraper or a coating machine to coat the electrode paste onto the copper foil.

9. The method for preparing battery electrodes for unmanned aerial vehicles according to claim 7, characterized in that, The step of stamping the vacuum-dried copper foil to obtain battery electrodes for drones is as follows: the vacuum-dried copper foil is stamped using a stamping machine to obtain battery electrodes for drones.

10. The method for preparing battery electrodes for unmanned aerial vehicles according to claim 9, characterized in that, The vacuum drying process is carried out at 80°C; and / or, The vacuum drying process takes 12 hours.

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